题解

-----------------------------------防透视---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

#include <bits/stdc++.h>
using namespace std;
int main() {
	string s;
	cin >> s;
	int sum = 0;
	for (int i = s.size() - 1, j = 1; i >= 0; i--, j *= 2) {
		sum+=(s[i]-'0')*j; 
	}
	cout << sum;
	return 0;
}

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